In this experiment, we did a Fischer Esterification using excess acetic acid, isopentyl alcohol, and sulfuric...
In this experiment, we did a Fischer Esterification using excess acetic acid, isopentyl alcohol, and sulfuric acid to form isopentyl acetate. Then sodium bicarbonate and NaCl were used in the extraction step of the experiment.
Is there another method we could have used to calculate percent yield other than using the amount of isopentyl acetate? What are the advantages and disadvantages? (Using GC is not the answer we are looking for.)
Homework Answers
Quantification of the product can also be done using NMR by using an internal standard.
Advantages:
1. Well resolved peaks. So quantification becomes easy.
2. The sensitivity of NMR is universal, so accuracy is better
Disadvantages:
Large quantity of product is needed for quantification,
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In this experiment, we did a Fischer Esterification using excess
acetic acid, isopentyl alcohol, and sulfuric...
We used the technique of extraction in this lab. After extraction, what was left in solution?...
We used the technique of extraction in this lab. After extraction, what was left in solution? Why is it acceptable for those chemicals to be left to sit for a week? Think about the possible reactions that would or would not occur during the week? In our extraction, we used NaCl solution. Why did we choose to use that vs. water? In this experiment, we did a Fischer Esterification using excess acetic acid, isopentyl alcohol, and sulfuric acid to form...
This experiment involved the use of Fischer Esterification to create isopentyl acetate from reacting isopentyl alcohol...
This experiment involved the use of Fischer Esterification to create isopentyl acetate from reacting isopentyl alcohol with acetic acid and sufluric acid. 1. Provide a balanced equation to explain the evolution of gas during the sodium bicarbonate washing step. 2. The microscale synthesis of esters often uses a Dean-Stark trap. A Dean-Stark trap separates and collects water during a reaction. How would using a Dean-Stark trap during a Fisher-Esterification affect the synthesis? 3. Esters are often used in artificial flavorings....
Assume you are doing an experiment on the esterification of isopentyl acetate using 1mL of isopentyl...
Assume you are doing an experiment on the esterification of isopentyl acetate using 1mL of isopentyl alcohol and 1.5mL of acetic acid. Assuming complete reaction, calculate the amount of acetic acid left in the post-reaction mixture at the end of reflux Calculate the amount of 5% aq sodium bicarbonate needed to neutralize the unreacted acetic acid
In the experiment of synthesizing isopentyl acetate by reacting an excess of acetic acid with Isopentyl...
In the experiment of synthesizing isopentyl acetate by reacting an excess of acetic acid with Isopentyl alcohol and using sulfuric acid as the catalyst, what was the purpose of doing a distillation after heating under reflux for an hour?
1. The reaction mixture contains isopentyl acetate, isopentyl alcohol, water, acetic acid and sulfuric acid. a)...
1. The reaction mixture contains isopentyl acetate, isopentyl alcohol, water, acetic acid and sulfuric acid. a) Why is the reaction mixture extracted with sodium bicarbonate? In other words, what two substances does sodium bicarbonate react with in the reaction mixture and why are these reactions useful? (4 pts) b) Write a balanced chemical equation for each reaction involving sodium bicarbonate. c) When the reaction mixture is extracted with sodium bicarbonate solution, what substances will be in the aqueous layer? What...
In Synthesis of Isopentyl Acetate experiment, how was the acetic acid and sulfuric acid neutralized after reflux has bee...
In Synthesis of Isopentyl Acetate experiment, how was the acetic acid and sulfuric acid neutralized after reflux has been completed? Write two separate balanced chemical equations that show how each acid was neutralized in this experiment. Isopentyl alcohol + acetic acid -> isopentyl acetate + water The reaction is treated with concentrated Sulfuric acid
Risk assessment for: Synthesis of isoamyl acetate via Fischer esterification Student Name: Chemical Potential hazards How...
Risk assessment for: Synthesis of isoamyl acetate via Fischer esterification Student Name: Chemical Potential hazards How could you be exposed to this hazard? given the exposure, Level of risk what is negative (probability) 0–4 outcome? Suggested protective measure Isopentyl alcohol Glacial acetic acid conc. Sulfuric acid aq 5% sodium bicarbonate anhydrous sodium sulfate isopenyl acetate
Risk assessment for: Synthesis of isoamyl acetate via Fischer esterification Student Name: Chemical Potential hazards How...
Risk assessment for: Synthesis of isoamyl acetate via Fischer esterification Student Name: Chemical Potential hazards How could you be exposed to this hazard? given the exposure, Level of risk what is negative (probability) 0–4 outcome? Suggested protective measure Isopentyl alcohol Glacial acetic acid conc. Sulfuric acid aq 5% sodium bicarbonate anhydrous sodium sulfate isopenyl acetate
We made esters from carboxylic acids and alcohol. (for one of them, acetic acid + isopentyl...
We made esters from carboxylic acids and alcohol. (for one of them, acetic acid + isopentyl alcohol + couple drops of sulfuric acid). Could someone please explain those. Thank you 1. Consider if we had prepared high molecular weight esters, what problems would this pose regarding our method of analysis 2. We used sulfuric acid as a catalyst, but carboxylic acids are a reagent in this reaction. Would simply using excess carboxylic acid work as efficiently as sulfuric acid to...
Fischer esterification lab question, Please help. Thank you in advance 1) In the synthesis of isopentyl...
Fischer esterification lab question, Please help. Thank you in
advance
1) In the synthesis of isopentyl ethanoate, whose reaction is
shown below
a) what is the purpose of the sodium bicarbonate solution in the
isolation step?
b) what is the purpose of adding molecular sieves to the
reaction?
c) what is the purpose adding sulfuric acid to the reaction?
d) why is acidic acid added in excess?
e) what is the purpose of conducting a semi-micro distillation
in the second...
1. The reaction mixture contains isopentyl acetate, isopentyl alcohol, water, acetic acid and sulfuric acid. a) Why is the reaction mixture extracted with sodium bicarbonate? In other words, what two substances does sodium bicarbonate react with in the reaction mixture and why are these reactions useful? (4 pts) b) Write a balanced chemical equation for each reaction involving sodium bicarbonate. c) When the reaction mixture is extracted with sodium bicarbonate solution, what substances will be in the aqueous layer? What...
Risk assessment for: Synthesis of isoamyl acetate via Fischer esterification Student Name: Chemical Potential hazards How could you be exposed to this hazard? given the exposure, Level of risk what is negative (probability) 0–4 outcome? Suggested protective measure Isopentyl alcohol Glacial acetic acid conc. Sulfuric acid aq 5% sodium bicarbonate anhydrous sodium sulfate isopenyl acetate
Risk assessment for: Synthesis of isoamyl acetate via Fischer esterification Student Name: Chemical Potential hazards How could you be exposed to this hazard? given the exposure, Level of risk what is negative (probability) 0–4 outcome? Suggested protective measure Isopentyl alcohol Glacial acetic acid conc. Sulfuric acid aq 5% sodium bicarbonate anhydrous sodium sulfate isopenyl acetate
Fischer esterification lab question, Please help. Thank you in
advance
1) In the synthesis of isopentyl ethanoate, whose reaction is
shown below
a) what is the purpose of the sodium bicarbonate solution in the
isolation step?
b) what is the purpose of adding molecular sieves to the
reaction?
c) what is the purpose adding sulfuric acid to the reaction?
d) why is acidic acid added in excess?
e) what is the purpose of conducting a semi-micro distillation
in the second...
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